Filter



Jan. 15, 1935.

P. WIRTH FILTER Filed June 16, 1952 IIIHI II I u lllllllll lllillIIIEJIJII R. mm H mm m V70 m L m M V B My invention relates 'to' filters," particularlylof the type' used in laboratory work'for filtering liquids/ and' resides-in the'iprovisi'oniof. meansz for tightly closing the filter and effecting a tight: seal between the pa'rts of the filter and thefilt'erdisc to prevent leakagez m' 3 2 Filters used in laboratories are :of 'severalitypes, some operating by pressure'andssome by suction "-to' force liquids th'rough the filtering element, ---usuall y in the form of a disc. Unless the edge of the disc isclampedtightly there will be. leakage whenitheliquid is passing through the filter. The most "common means forcla'mping and com- I pressing the' filter pad or disc have been bolts -'and nuts engageable with the filter casing and spout member to draw them together with the filter pad clamped therebetween. This means is .not-only inconvenient to manipulate due toythe 'pluralitybf-"bolts and nuts, but iscumbersom'e, expensive'and' does not automaticallyhprovide even compression on all parts of thefilter pad. Another means has been to providethe casing and spout part withcooperating screWthTeads' to directly secure them-together, abut this does not provide agood tight seal and when used on suction filters air is sucked in between the screw threads causing foaming of the liquid,-which'1is 3 a I condition to be avoided. Furthermore; iliquid oozing or leaking out from the sides of the-filter pad will get into'the sterile-flasks; which isalso to be-avoi'ded. w em accordance with my present invention, one ofthe' parts of the filter,- prefer'ably the casing orchamber into which the liquid'is discharged, is providedwith ayoke rigidly connectedthereto, the yokehaving across-arm positioned 'across the open end of the casing in spaced relation thereto. 1 The other part of the 1f casing;' i-which may be called the spout portion; includes a cap to fit-the open end of the casing beneath the cross-arniof the yokeandis prov-ided' with a flange to fit around the wall: of the casing :at its open end. "This-flange 'may be slightly spaced from'th'e wall of the casing to provide a :emnner .to retain any liquid which may 'ooze out;-which will be 'a'-small amount,"if anyi due to thetightseal provided bymy invention. The filter disc is disposed within the cap and flange so that when the cap is applied to the open end of the casing, the upper edge of the open end of the casing will engage against the surface of the disc, the other surface of which will be against the portion of the cap. The cap has a spout rigidly connected thereto and a portion of the spout is provided with screw threads adjacent l iw h w "r ermm afidii ifii jfi; 1.932 swam. 6174 51 the 'caplto receive a nut,' preferably i xof 'a'disc having its external peripheryiknurled -to facilitate grasping: and turning on-r the scr'ew threaded portion of the spent, sothat' the' niit Y can be: thus :moved: untilit' bearsagainst"the cross-arm of thef'yok e to draw the5ca'p ancl casin'g tightly together to compress' the entire edge "showing-the closure in the filter; am -1;

vcasingv 5, 'an*i'inlet"8' for connection with of the 1 disc between the edge of the open end of zthe casing-.and theinne'r surface of the can. i i i *1: Thus, and as willbe more fully "explainedin detail hereinafter; the'lparts'o'futh'e filter may be quickly andrtightly assembled to prevent-leakage of liquid by' a single operatingmember; and

-'withthe compressing par-ts carried. ..byl.': the respective partsof the casing .so thata there' is no likelihood of any of theselements becoming lost, "because when the. only movable part, nameIyJtI-Xe nut, is :turned to permit the spout member to be removedfromthe casing it must move on'the screw threads on the spout nearer to thecap for s away from the free end of "the. threads;

The objects and advantages of the inv'en ion may thus be seen to reside'irithe provision 'of a simple; durable, easily operated andhighly effecv-tive'means oflsealing aifilter, and susceptible of 1 5 vmanufacture'at a relatively low :costi I y i The foregoing 1 and other objects and} "a'dvanfta'ges .of the invention will become apparent l during the course of the following description-o the accompanyingdrawing; in which 'Fig'yil is a side elevation of a-filterwnh the ig. 1- looking in I another direction 'and' with parts shown seetion;r. l Fig. 3 is a fragmentary' and large elevation positionforremoval f-r m :..'Fig'.f4'is aview taken on the line of Fig. 2.

Referring to the drawing-the numeralfi de g- 'nates (a casing throug h one end a R mountecl 'a stem Lpr'ciVicled 'With p'ling '7 on" its outer end. for 'conhectio There is j also 1 mounted 5 through saidend cc'onduit leading from a-soui'ce-of compressed air.

cap 9 has rigidly connected thereto a spou which is provided adjacent the cap with screw threads 13 which receive a nut 14 which, as illustrated, may be in the nature of a disc provided with a knurled'periphery to facilitate grasping and turning of the nut.

'A yoke indicated generally by the reference character 15 has side arms 16 rigidly connected to opposite sidesjof the casing and an intermediate @W PF QQKM 9 9 i ;h

open e'ndeof theicasinwin spaced relatlomthereto preferably a distance approximately the same as the distance bet 10 and the end of the screw threads 13. The cross-rod 17 is provided with a bend 18 ati --its approximate center to receive the spgitguwhen the cap 9 is applied to they e ing, at which time the dise ii wilif besituated between the freeedge of the walls of; theeasing 20 and the interior of the cap 9. With t he" parts so assembledg it31will =benobvious thatnwheniwthesnut sthe nut (will comes-into contact; withrt hecbeudv 18 s caznd as the nutis iturned in contact with the bend :I orced itogether toi' compress :the j:portion of the disc 51 labetween the free: endaoi the casing and thei-nterior of theicap 9. -.'-I'he compress'ion may irbeiqui'ckly-aand convenientlycreatedrto such an :extent with relativelyclight'aeifortaas to? tightly tandicompletely seal thecclosure{between the'acasfling and canto;preventzescapementgof liquid.

7 Itqwilh-bei '-understood;-; that the adevicercanv be 5 'flntnishedr complete with: the; .parts; assembledyin ,the position showminqEig- 1;? and; it} wills be: im-

qpossibledfor the-partseto become disassembled be- 1 cause: the nut 1 4- rnustlbej' moved inwardlyuon-r the ;scre,w, threads -13 -;-until= it. is;substantially"irr contact--;with the apa-9; before thereiwillw be.:suflicient clearance providedYibetweenz the.aflange:10 ;-and=-open end of the zcasingfto permit;withdrawal 'i tn heipou zm m er. 1'

of 3 its threadswarea in; engagement with threads on theispout' member. and a thereaarer still threads of the spouts-member: between thet nut .and thepfree end30f thel-spoutcso thatthera is no .ljkelihood of theqnut ,becomingzaccidenta'llyipdisplaced;- or ;lost. Thus; fthe-riilter eis providedein {50 a two parts forminga complete unit. GT0 assemble it, it zisvsimplymecessary tocinsert the cap with the nut screw down thereagainstt into:thezspace between the side arm' 16.; and across-rod 1 7, otfthe -v k flmfz wthe spout is seatedeini-the bend: 18, at which time the flange 10 will engage around ;the sides of theeasihg; Them by turning-J the :QW'; 14 the pa simay-ibe xtiehtly a together as previously explained to ti g -I have-Vshown' on thewnut 14' 5am upstanding m0 .e .nnu 1ar -r 19, :the circumference fiof iwhlch is uhstantially ,the sa memsz-theiwidth oi theabend in-- the;cross;,- arm-of theyoke ,r-i'l'hisinpstandg gannular s adapted forscontact withq-the V utia-acnewedagainst. the-yoke parts; gandmay be1so1-polishedior ed ,as to creategelatively:littledrictionzand ta r Q RQiIlBEi YQmGntz oil-the "p t ween the bottom 01' the hange pen end of the casghtlyseal the; casing. I

I have shown and described a pressure operated filter merely for the purposes of illustration but do not limit the invention to such filter as it is applicable with equal efliciency to other types and styles or filters of various sizes and r 5 uses.

. I claim: 1. A filter of the character described comprising a casing having'an open end, a, closure cap a yoke rigidly and permanently connected to the easing and having an arm extending across the cap in spaced relation thereto, a screw threaded portion on the'spout between said arm of the 15 ypka'and the eap, said yoke having an opening at qne side 'to receive the spout, and a nut carried -by said screw-threaded portion and moveable w thereongagainst the yoke to force the casing and cap toward each other, said yoke and spout being 20 i'disconnec'ted; whereby-ftheticap withq-xthe =;spout and; nut-may be :removedironr the casinoandi 'SyOkBTIIWiII ibG IflflllJGdQQD'lfihfl casingain flxedposi- ZtionL w I tzmAinltea of-atheccharwten described .comprise25 ing a casing having an open'w-enmza closure; cap .ior thesopen i end; ,a :spoutx connected ,to ;-the;-'oap,

i a yoke *rigidlytconneeted: to the casing andwhavsing an 1 arm v -extending acrossrj -the cap, in spaced sj-relatio'ri thereto, aascmew threadedwport-ion" ngthe s0 spout? betweenrsaidarmaofithc; yokeiflnditheicap, :and a; nut Ecarried ibyisa-id screW QthITQwQdIRQ QOI and: moveable; thereon gas'ainst-theiyoke-vt iorce the casing :and cap towardeach? $01 116); Sflid IQS arm having a 'c-ibend to" receive the-s spout and +35 eagainstz which-the -nutgbears; I

3; Afilter of the icharacter rdescribed comprisr ingsa' casing having, an iopen"=end;-.- a;closure.;ioap tiomthecopemend;,,-a.spouticennected thacap, La yoke rigidly connectedto: the) nddfl&Y-. .ing amJ'arm-Jextending across the. an :-1 me relationitheret n a; screwithreaded: nortiomon the espdut betweenrsaid 0f {the yoke and thepqap, -randa nut carriede-byisaid 'screwithreaded portion V -and moveable' thereon against;'the;-yoke {to-forge 5,545 ather casing-and -cap toward-each; other -said cross having: a {bend to, receive; the epout and against which the nut'bearsizand said nut; having an upstanding annular, irib ;toqabut:isaidcbend.

:fi-lter of: the, charactergrdescribed jcomprisg ing a casing having an open end,j a,closure; cap efor thenopen' endzaof the casing evoke-rigidly connected to the} casing Jand:having;;amarm ex- ,tending across the cap in,;spaced:2re1at ion: thereto land-provided withea: bend;intermediateaitsm d 21:55 I an spout? connected tothe-cap independentlygiof rethe yloke; a ,screw; threaded=,=port ion on qtheqspqut rbetweemsaid; arm of the-pyoke. and; the capcwhen ithe :capiimapplied:itoithet-casingg and-a nutear,- :-ried:,by=-said screw threaded portion and-movlahlet thereon a'gainst thebendiin {the yoketodorce g thenzcasingu and cam toward 1each;,oth'er,,i the:;nut theme movableztovgand the-"c nyon the s e {threads of said screw-threaded portion tozenable removal; oft-said cap from r 1311856881113": and zbeinggg retained by said threadsewhen-the capieremoved. 

